Cutter head



Feb- 10, 1931- H. s. WALTHERS ET AL 1,792,205

CUTTER HEAD Filed April 12. 1930 Patented Feb. 10,v 1931AUNITEo-s-"rxri'zs,

y HARRY s. lWifrL'rnnas Anni-vieron olrnnnoir, Wisconsin.lAs-psiefivons' 'ro Yarns-AMERICAN MACHINE COMPANY, on isfnLoI'r;`WrsooNsiN, A conformaron or Y DELAWARE l Appiieation med Aprilia,

This invention has to do with the cutter heads W`hich are Vused in WoodWorkingmachines, and. is particularly concerned With the manner inVWh'ch the bits are attached to the fheads.v Y v Y v The principalobject of the invention is to provide an improved fastening device Withwhich a bit can be quickly and securely attached to a cutterV head. e

Anotherlimportant objectV is to provide a knovelffasteningdevice whichwhen loosened will `iioat laterallyof Vthe head with the `bit into anydesired position of adjustment. Other objects and advantagesoftheinvention will be apparent `to those skilled in the artfupon. a fullunderstandingfof the vconstruction, arrangement -and'operation of thefastening device.

One form of herein for the purpose of exempliication, but it will ofcourse be understood that the invention is susceptible of embodiment linother structurally modified forms coming equally Within the scopeof theappended claims.-

In the accompanying drawing:

Fig. 1 is an rend vieW vof a cutter head equipped with the fasteningdevice of the invention; Y

Fig. 2 is a face view of the head;

Fig. 3 is a radial section through the head, taken on the line 3 3 ofFig. 1;

Fig. 4 is a perspective view of onel of the side clamps; Y v

Fig. -5 is a similar-view of the center block; and

Fig. 6 is a similar view of the other side clamp. Y

The cutter head shown in the drawing is Y provided with a plurality oftransversely eX- tending grooves 10 in Whichthe fastening del vices 11for the bits 12 are positioned. The bits 12 overlie the grooves'10 andare -pro vided on their inner surfaces with dovetail tongues 13 whichextend tangentially of .45 thehead at right angles to the grooves 10.v

the invention is presented CUTTERjHEAD 1.9304' Serielle- #wel i 1 Thetongues are l transversely' corrugated Y and seat against -latcoplanarsurfaces-14 and 15 onthe head1 at` opposite` sides the grooves 10.' Thesurfaces linfront ofthey v grooves .are transversely corrugated' andvin? ter'lock to an extent .Withthe lcorrugations'on the front portionsof-thetongues 135 .The

sides ofthe grooves 10fare"provided-Withribs 16 WhichV present'-invvardly kfacing shoulders 17a` and .Y outwardlyfacing .shoulders 18.

`,Ther fastening devices 11 consist of y'center blocks 19, sideclamps20, side clamps 21,

andtie bolts 22. The blocks, 19 are positioned in the grooves -1(7) inthe head beneath the `tongues 13 onthelbit's, as'shov'vn in Fig. 3,

and are providedvvith grooves23 in the sides Athereof which interfitVWith the tongues 116 `r on. the sides'fof thegrooves 10 and hold the Y.blocks substantially'iiush With the surfacesV 1411and'15.V The blocks 19are apertured from.

end to end vforthe reception ofthe bolts 22 vand are provided at theirendsl Withv inclined clamps20 and 21.*V Y v `1 AThe clamps 20 A k21 arepositioned in'` the grooves 10 atfoppo`site' ends oftheblocks 19 and areprovided Ywith'l inclined dovvnvvardly'fv surfaces 24f-for Wedgingcoaction With the v Wedging surfacesf25 and, inclined upwardly .Y

Wedging'surfaces '26., The surfaces 25 en-y gage `With thecorrespondingly inclined side edges i'of thetongues 18'on the bits,While the surfaces26 engage Vwith the correspondingly inclined surfaces24 on the ends oftheblocks '1.9 Theclamps 20 and` 21 are apertured forthe reception'of the bolts 22. The apertures intheclamps20 arescrew-threaded vto en'- f gage With the threads 27 ori-the bolts, vvhilethe apertures in the clamps 21 `are counter-V sunkto receive the heads28 oftheV` bolts, V

Whichheads are preferably-provided with Wrench sockets 29. rVV'hen theclamps 20 and V21 are dravvnftogether by the bolts 22, they tendV toforce the blocks 19 outwardly into I firm interlocking engagement Withthe shoul'- dersr17- of vtheribs 16 on'the sides of the "-'ff beingshiftable laterally grooves 10 and serve to force the bits 12 inwardlyagainst the surfaces 14 and l5 or" the head, thereby holding the bits l2securely in proper cutting position. n i

To advance or retract the bits 12, itis inerely necessary to loosen thebolts 22 a suicient amount to'allow the tongues 13'to slide lon-Vgitudinally between the wedging surfaces 25 of the clamps, while Vtoadjustjthe bits laterally, itis merely necessary to loosen theV bolts 22enough to permit'thejclainping .de- Vicesto float in the grooves 10 landshift transversely of the headwith the bits.

The `number of the clampingV devices used ,with each ibit. Awill ofcourse depend upon the width of' thexlatter.' In the xp'articulara'sscnibly shown in the drawing, the bits. 12,l

device in the groovebeneat'h the tongue consisting of a center blocklocked in the groove Vagainst outward movement, and two side clampswedged Yagainstboth the ends of the` block and the sides of the tongueto press the center block outwardly and draw the bit nwardly.

In witness whereof we have hereunto sub-v scribed our names. Y Y

' -HARRY S. WALTHERS.

AVICTORE. MARTIN. l

are of such width. to make the useyo twol Y' 't holding devices foreachadvisable; `Where M two holding devices are employed, thecenterportionsgBO ofthe bits 'are advantageousily` made flush with thetongues '13. '(see -v We claimrz' f ,p5-1,. Inaasteninglld-evice'otthecharacter i described, the'combinationI with acutter i head havinga transverse groove therein, and

at right angles to the groove, of-a blockfbeneath the tongue in;outwardly locked associvation withthe groove, and clanpspatftheendsof'the. bloclr. engageable with'thelatter f I ifand the tonguetodi-'aw the ,bitwadia'lly tol.

ward the head.

"\ i .2."lnl a. fastening device joffthe'character described, thecombination vwith a cutterhead having a transverse groove therein, and abit having-a tongue-on the bc'ttomthereof at right angles to the groove,ott a bloclrbeneath y bit havin'gatonguezon the bottom'thereoi:

theftongue in' outwardlylocked association Lwith the groove, and `clampsat the ends/'of thebloclrengageable with the latter andthe tongue toldraw the bit radially toward the head, said block vand clampsbeing-,shiftable as a unit transversely lof l.thehead within the Ygroove when the cla-mpsiare loosened, where# by to .permitlateraladjustmient" of the bit. 3.1In a fastening-device of thecharacterdescribed, thecombination with a cutter head 2i: having aV transversegroove therein, and abit having a tongue on 'the-bottom lthereof at' fright angles to the groovepof a bloclrb'eneath v the tongue inoutwardlyv lockedrassoci-ation withk the groove,'and clamps atA the endsof the, block engageable with theilatter and the tongue-to draw the'bitradially toward the right vangles tothe groove,*and a Yfastening

